// Cyrillic is mostly 2 and 3 byte runes.
		benchBytes(b, indexSizes, bmIndexRuneUnicode(unicode.Cyrillic, 'Ꙁ'))
	})
	b.Run("Han", func(b *testing.B) {
		// Han consists only of 3 and 4 byte runes.
		benchBytes(b, indexSizes, bmIndexRuneUnicode(unicode.Han, '𠀿'))
	})
}

func bmIndexRuneASCII(index func([]byte, rune) int) func(b *testing.B, n int) {
	return func(b *testing.B, n int) {